Acronym for "fuck me or fuck off". An attitude in which if a person is sexually attracted to someone else, they either want to be dating/having sex with them or not associate with them at all, because just being friends isn't good enough.
Retard: You are one silly mofo.
Cool Guy: Oh no you did not...
Retard: Yes, I did. My mommy loves me and she said so too.
Cool Guy: SHUT UP, you fomofo!